Coring apparatus



Nov. 7, 1961 c. e. PEARSON CORING APPARATUS 2 Sheets-Sheet 1 INVENTOR CARL G. PEARSON Filed Sept. 4, 1958 ATTORNEY the invention is concerned.

United States Patent 3,007,686 CURING APPARATUS Carl G. Pearson, 2147 Maplewood Ave., Willow Grove, Pa. Filed Sept. 4, 1958, Ser. No. 759,839 7 Claims. (Cl. 26219) 'is actuated under motive power, such as compressed air to effect a combined reciprocative and rotative movement to the drill head. This type of tool has normally been used for drilling small holes of the order of three inches in diameter.

According to the invention, auxiliary apparatus is provided for this type of tool which permits the tool to be revolved and the drill head to cut large diameter arcs or circles, until a cylindrical core is severed from the wall. Due to its combined rotative and reciprocative motion and the simultaneous application of pressure the tool drill head can sever a core from a wall several feet in thickness and provide an opening to receive large diameter conduits or piping.

FIG. 1 is a perspective view of the assembled device applied to a concrete wall for demonstrating the apparatus in position for operation.

FIG. 2 is an enlarged elevational view taken from the right end of the device of FIG. 1 with the tool removed therefrom.

FIG. 3 is a detail of a modification of a portion of FIG. 1.

FIG. 4 is a side elevational view of a modified form of the device or mounting for a tool assembly.

FIG. 5 is an end view of the mounting of FIG. 4.

FIG. 6 is a side elevational view of another modified form of mounting.

FIG. 7 is an end view of the mounting of FIG. 6.

Referring to FIG. 1, the numeral 10 indicates a concrete wall of, for example, 2 feet in thickness. The tool is shown generally at 11 and comprises a housing 12 in which is located the usual elements for rotating and reciprocating the drill head 13. The motive power is supplied to housing 12 by line 14 from a source, not shown, and handles 15 are provided by which an operator manipulates the tool. The drill shaft 16 between the housing 12 and the drill head 13 is usually hollow so that air or a mixture of air and water may be supplied thereto for removal of cuttings from the drilled area in the wall 10.

The tool, as generally described above, is well known and provides an example of one type of tool with which The apparatus which is adapted to be assembled with the tool comprises a support 20 in the form of an elongate cylindrical shaft which extends through a centering hole C and has one end 21 positioned beyond, or exteriorly of the rear face of wall 10 and the other end portion 22 positioned exteriorly of the front face of the wall. One pair of arms indicated at 23 and another pair of arms indicated at 23a are fixedly secured, as by welding, to a channel member or brace 24.

The channel member or brace 24 is provided with a sleeve 25 which receives the drill shaft 16 and permits it to be rotated and reciprocated. The channel member or brace 24 also has a clamp means in the form of jaws 26 and 27 which are provided with bolts 28 and cooperating threaded nuts for securing the housing 12 thereto,

the jaw 27 of the clamping means being Welded or otherwise fixedly secured to the brace or channel member 24. As shown in FIG. 1, the longitudinal axes of the elongate shaft 20 and the brace 24 are positioned in. the same plane.

The pair of arms 23 and the pair of arms 23a are respectively provided with sleeves 29 and 29a which receive the end portion 22 of the elongate shaft 20 and the arms extend radially therefrom as shown in FIG. 1. Each of the sleeves 29 and 29a is fixed to a pin 30, each pin being disposed between a pair of arms and the sleeves adjustably secured to the arms by nut clamping means 31 as indicated in FIG. 3. The pin 30 in FIG. 3 is shown provided with a bearing 30a which is welded to sleeve 29 forming a unit which may be pivoted and adjusted to the position shown in dotted lines by means of the slots 32 provided in arms 23. Slots 32a are provided in the arms 23a as shown in FIG. 1 to permit similar adjustment of sleeve 29a and the resultant variation in the radius of operation of the drill head 13.

A counterbalance indicated generally at is provided and comprises depending U-shaped straps 41 and 41a which are slotted at 42 and 42a respectively and are adjustably secured to the arms 23 and 23a by adjusting bolt and nut clamps 43 and 43a as shown in FIG. 2. The straps 41 receive in their cradled lower ends 44 and 44a an elongate shaft 45 which is fixed thereto and provided with weights 46. The shaft 45 will be arranged for the addition or removal of weights 46 in order to provide the desired counterbalancing effect.

The rear end portion 21 of the main support 20 is provided with a keyway 50 in which is pivotally mounted a locking key 51. The locking key 51 is unbalanced. During insertion of the end 21 of the support in the hole C the key 51 reposes in the slot 50 but will be gravity actuated to the locking position shown in FIG. 1 after the end portion 21 passes through the wall 10.

A strong coil spring 52 is provided on the end portion 22 of the support, preferably as shown, between the sleeve 29 and collar 53. The end portion 22 is provided with a plurality of holes 54 to receive pins 55 for varying the force of spring 52 through adjustment of the position of collar 53 relative to the sleeve 29.

Operation of the apparatus as assembled in FIG. 1 should be generally apparent to those skilled in the art. When the tool 11 is adjusted the desired distance from the support 20 for coring an opening of suitable diameter, the coacting spring 52 and locking key 51 will maintain the drill head 13 in pressure contact with the front face of the wall 10. By revolving the tool 11 about the support 20, either continuously or back and forth through selected arcs, the drill head 13 will by its combined reciprocative or pounding action and by its rotative or grinding action cut a ring-like opening in the wall and sever a core which will be centered about the support and may be removed therewith.

The tool 11 may be revolved about the support 20 in any desired manner. Manual operation or suitable mechanical means may be employed.

By means of the adjusting arrangement of FIG. 3, the tool may be angularly disposed with respect to the wall, and by proper manipulation of the tool, the ring-like opening may be cut to provide a core having different diameters in the front and rear portions. This may be desirable in order to provide an opening having a rear edge which will receive a conduit in tight fitting or practically sealing relation therewith, for example, in order to reduce the seepage of water into the opening from damp ground surfaces which may be adjacent the rear face of the wall.

In the modification of FIGS. 4 and 5,. an elongate sup porting shaft which may be formed of bar or tubular stock is provided and differs from the supporting shaft of FIG. 1, in that no apertures to receive the holding pins for the spring are necessary. The front end portion 61 of the shaft may be received in a centering hole formed in the wall to be cored, and secured similarly to the shaft of FIG. 1 or it may be otherwise secured normal to the face of a wall or structure which is to be cored, for example, by bracing its rear end portion 62 to force the front end portion 61 in fixed position relative to the structure to be cored.

An elongate solid brace 63 having a front connection or guide which may take the form of a split collar or sleeve 64 extends outwardly of the brace to rotatably receive the drill tool shaft 16, while a rear connection 65 extends outwardly in the same direction as guide 64 and may take the form of a U-shaped band which receives and fixedly secures the motor housing 12 to the rigid brace 63 by securing nuts 66. Front and rear rigid spacing means or elements 6767 are similarly designed and are rigidly secured to brace 63 to extend therefrom inwardly of the brace and in the direction opposite to the front and rear connectors 64 and 65.

Each spacing element 67 as shown in FIG. 5 is in the form of a plate having a group of apertures 68 therein of a size to conveniently receive the supporting shaft 60 to permit relative rotative and longitudinal movement between the shaft and the plates. As shown the apertures 68 are preferably arranged in aligned rows with the apertures of adjacent rows being disposed in off-set relation. The aperture arrangement is to provide sufiicient apertures in the plates to permit the shaft to extend through selected corresponding or aligned apertures in the front and rear plates, and provide for varying the distance between the tool assembly and supporting shaft 60, for example, in one quarter inch distances to provide selectivity in the diameter of the core it is desired to drill out or sever from the structure. The plates 67 are welded to or otherwise rigidly secured to the rigid brace 63 and, by virtue of the fixed connector 65 the tool assembly and mounting therefor can be rotated and moved longitudinally of the supporting shaft 60 to drill out a core from a structure.

The modification in FIGS. 6 and 7 differs from the invention heretofore described in that spacing elements are fixed to the supporting shaft to effect rotation of the shaft along with the mounting and tool assembly during the coring operation. In this arrangement, the elongate supporting shaft 70 will have its front end portion 71 disposed within a slightly oversize opening which extends through the wall in order that the supporting shaft may rotate within and move longitudinally of the wall as a core is being drilled. The shaft 70 may be suitably braced in order to maintain it generally normal to the structure being cored. The brace 63 may be of solid stock and have the front and rear outwardly extending connections 64 and 65 formed as they are shown in FIG. 4.

The front and rear spacing elements 73-43 are similar and may be made of bracket arms, as shown in FIG. 7, having their upper ends welded or otherwise secured rigidly to the elongate brace 63. Each of the bracket arms of the spacing elements are slotted at 74 to receive a bolt 75 having a nut 76 for adjustably securing the spacing element to the supporting shaft 70. To this end the sup porting shaft is provided with a front and a rear hole for reception of the bolts 75 which extend through the slots 74 and holes in the shaft 70 to adjustably secure the spacing elements to the shaft.

In all embodiments of the invention a mounting is provided for a drill tool assembly of the type which has a front drill shaft and a rearwardly disposed housing for the drill shaft actuating means. The mounting permits a core of a predetermined diameter to be cut, grooved, or severed from a wall or other structure by operator manipulation of the tool assembly and mounting.

The essential elements of the mounting aspect of the invention comprise a rigid elongate brace having a front connector for the tool shaft which permits rotation of the shaft and also guides the shaft to provide for the cutting of a confined groove by the drill tool and also a rear connector for fixedly receiving the housing. Additionally front and rear spacing elements are required for receiving a supporting shaft which provides an axis for revolving the drill tool assembly and mounting about the face of a structure being cored and permits longitudinal movement of the tool assembly and mounting relative to the structure.

The front and rear connectors are rigidly secured to the elongate brace and both extend from the brace is one direction while the spacing elements are also rigidly secured to the brace and extend therefrom in the direction opposite to that of the connectors. The mounting receives the tool assembly and the support-ing shaft with the elongate brace positioned therebetween and thus the tool assembly, the elongate brace and the supporting shaft are positioned in a common plane. The spacing elements are constructed or arranged to permit adjustment of the distance between the tool assembly and the supporting shaft providing for varying the distance between the tool assembly and the supporting shaft in accordance with variation in the diameter of the opening it is desired to provide in the Wall or other structure.

The elongate supporting shaft provides an axis about which the tool assembly can be revolved and also functions to provide for longitudinal movement of the assembly toward or away from the structure being cored. Consequently the front and rear spacing means of the mounting may be variously received by or receive the elongate supporting shaft to eifect these movements of the drill assembly.

The invention provides a mounting for or in combination with a motor operated drill tool assembly which permits an operator to position the elongate supporting shaft of the mounting in a small diameter opening in the structure to be cored or to otherwise secure the supporting shaft normal to a readily accessible face of the structure. The tool assembly is then manipulated by the operator to revolve the drill tool carried by the drill shaft in contact with the face of the structure being cored and simultaneously to urge the drill tool in a forward direction in order to effect a drilling out or grooving of the structure and thus to form a core which may be removed therefrom and provide an opening of the desired diameter for receiving conduits, piping, etc.

I claim:

1. Apparatus for coring a concrete or the like wall which comprises in combination an elongate reciprocative and rotative drill shaft having a drill head at one end, an elongate tubular support, said support extending through an aperture in the wall and having one end portion disposed exteriorly of the wall rear face and its other end portion disposed exteriorly of the wall front face, spacing means rotatively received by said support providing an adjusting portion and a portion for rotatably receiving the drill shaft, said adjusting portion providing for varying the distance between the support and drill shaft, spring means carried by said support for forcing the drill head in contact with the wall front face, pivoted lug means at said one end portion of the support for abutting the rear face of the wall and cooperating with the spring means to maintain the drill head in pressure contact With the wall whereby continuous rotation of the tool head about the support causes a cylindrical section to be cored from the wall.

2. Apparatus for coring a concrete or the like wall which comprises in combination a rotatable drill shaft having a drill head at one end, a support extending through an aperture in the Wall with one end portion disposed exteriorly of the wall rear face and its other end portion disposed exteriorly of the wall front face, spacing means between and rotatably receiving said other end portion of the support and the drill shaft, spring ans carried by said other end portion of the support and abutting the spacing means for forcing the drill in contact with the wall front face, means at said one end portion of the support for abutting the rear face of the Wall and cooperating with the spring means to maintain the drill head in pressure contact with the wall whereby continuous rotation of the drill about the support causes an annular section to be cored from the Wall.

3. Apparatus for coring a concrete or the like wall which comprises in combination an elongate reciprocative and rotative drill shaft having a drill head at one end, an elongate tubular support, said support extending through an aperture in the Wall and having one end portion disposed exteriorly of the Wall rear face and its other end portion disposed exteriorly of the Wall front face, a bearing sleeve rotatably mounted on said support, bracket arms secured to said bearing sleeve and extending laterally therefrom, means interconnecting the bracket arms with the drill shaft, adjusting slots in said bracket arms having means to vary the spacing between the support and drill shaft, spring means carried by said support and abutting the bearing sleeve for forcing the drill head in contact with the wall front face, pivoted lug means at said one end portion of the support for abutting the rear face of the wall and cooperating with the spring means to maintain the drill head in pressure contact with the Wall whereby continuous rotation of the tool shaft about the support causes a cylindrical section to be cored from the Wall.

4. Apparatus for coring a concrete or the like well which comprises in combination an elongate reciprocative and rotative drill shaft having a drill head at one end, an elongate tubular support, said support extending through an aperture in the wall and having one end portion disposed exteriorly of the wall rear face and its other end portion disposed exteriorly of the wall front face, a pair of bearing sleeves rotatably mounted on said support, a pair of slotted bracket arms for each of said bearing sleeves and extending laterally thereof, means for adjustingly securing the bracket arms to the bearing sleeves, a rigid brace extending longitudinally of the support and interconnecting the bracket arms, means for rotatably connecting the rigid brace to the drill shaft, spring means carried by said support for forcing the drill head in contact with the Wall front face, pivoted lug means at said one end portion of the support for abutting the rear face of the wall and cooperating with the spring means to maintain the drill tool in pressure contact with the wall whereby continuous rotation of the tool shaft about the support causes a cylindrical section to be cored from the wall.

5. Apparatus for coring a concrete Wall structure or the like comprising a drill assembly including a motor housing and drill spindle having their longitudinal axes in general alignment, in combination with a mounting for the drill assembly, said mounting comprising an elongate shaft, a first arm and a second arm carried by said elongate shaft and extending radially therefrom, brace means interconnecting said first and second arms and having its longitudinal axis in the same plane as the longitudinal axis of the elongate shaft, sleeve means on said brace means and receiving said spindle to permit rotative and reciprocative movements of the spindle, clamp means on said brace means and securing said housing to the brace means to permit the drill assembly to be rotated as a unit about the longitudinal axis of the elongate shaft and said sleeve means on the brace means providing a guide for the spindle whereby the spindle will be maintained in a confined circular path when the drill assembly is rotated.

6. Apparatus as in claim 5, further characterized by said first and second arms each being carried by said elongate shaft through a sleeve connection to permit axial and rotative movements of the drill assembly relative to the elongate shaft.

7. Apparatus as in claim 5, further characterized by said first and second arms having means for adjusting the spacing between the drill assembly and the elongate shaft in order to provide for varying the radius of the circular path.

References Cited in the tile of this patent UNITED STATES PATENTS 464,374 Le Grand et al Dec. 1, 1894 1,079,735 Altenhoif Nov. 25, 1913 1,264,424 MoWlds Apr. 30, 1918 1,439,679 Brewster Dec. 19, 1922 1,674,669 Stedman June 26, 1928 2,586,773 Ball Feb. 26, 1952 FOREIGN PATENTS 101,895 Australia Aug. 23, 1937 

